Variable turbine geometry

Abstract

A variable turbine geometry may have guide blades rotatably mounted in a blade bearing ring. An adjusting ring may be arranged on the bearing ring and an actuator may be configured to adjust the adjusting ring via a link lever. An adjustable eccentric may be arranged on the link lever and guided in a groove arranged on the blade bearing ring. The eccentric may be configured to stop on at least one end of the groove to limit at least one minimal flow through the variable turbine geometry.

The invention claimed is: 
     
       1. A variable turbine geometry, comprising: guide blades rotatably mounted in a blade bearing ring, an adjusting ring arranged on the bearing ring, an actuator configured to adjust the adjusting ring via a link lever,
 an adjustable eccentric arranged on the link lever and guided in a groove arranged on the blade bearing ring, 
 wherein the eccentric is configured to stop on at least one end of the groove to limit at least one minimal flow through the variable turbine geometry. 
 
     
     
       2. The variable turbine geometry according to  claim 1 , wherein the eccentric is designed as an axial extension on a link lever head, and wherein the link lever head is configured to interact with the adjusting ring. 
     
     
       3. The variable turbine geometry according to  claim 2 , wherein the eccentric is at least one of caulked, riveted and spread to the link lever head. 
     
     
       4. The variable turbine geometry according to  claim 2 , wherein the groove on the blade bearing ring is open towards a face end and to the outside of the bearing ring. 
     
     
       5. The variable turbine geometry according to  claim 4 , wherein the eccentric is at least one of caulked, riveted and spread to the link lever head. 
     
     
       6. The variable turbine geometry according to  claim 5 , wherein the eccentric includes a sleeve body, which can be inserted into an opening formed in the link lever head, and a holding portion of the sleeve body is arranged in the interior of the opening, and wherein a core body is arranged in the interior of the sleeve body to radially brace the holding portion in the opening and fixe the eccentric on the link lever head at least one of axially and rotationally. 
     
     
       7. The variable turbine geometry according to  claim 6 , wherein the sleeve body in the holding portion includes an internal cone configured to interact with an external cone of the core body for radially bracing the holding portion. 
     
     
       8. The variable turbine geometry according to  claim 1 , wherein the groove on the blade bearing ring is towards a face end and to the outside of the bearing ring. 
     
     
       9. The variable turbine geometry according to  claim 1 ,
 wherein the eccentric includes a sleeve body, which can be inserted into an opening formed in the link lever head, and a holding portion of the sleeve body is arranged in the interior of the opening, 
 wherein a core body is arranged in the interior of the sleeve body to radially brace the holding portion in the opening and fix the eccentric on the link lever head at least one of axially and rotationally. 
 
     
     
       10. The variable turbine geometry according to  claim 9 , wherein the sleeve body in the holding portion includes an internal cone configured to interact with an external cone of the core body for radially bracing the holding portion. 
     
     
       11. The variable turbine geometry according to  claim 9 , wherein the core body has at least one of a crowned and spherically curved outer cross section. 
     
     
       12. The variable turbine geometry according to  claim 9 , wherein the sleeve body on its outside in the holding portion includes a friction-increasing layer, and wherein the friction-increasing layer is a chemical nickel matrix with silicon carbide particles embedded therein. 
     
     
       13. A charging device comprising: a variable turbine geometry having:
 guide blades rotatably mounted in a blade bearing ring, an adjusting ring arranged on the bearing ring, an actuator configured to adjust the adjusting ring via a link lever, and 
 an adjustable eccentric arranged on the link lever and guided in a groove arranged on the blade bearing ring, 
 wherein the eccentric is configured to stop on at least one end of the groove to limit at least one minimal flow through the variable turbine geometry. 
 
     
     
       14. The charging device according to  claim 13 , wherein the eccentric is designed as an axial extension on a link lever head, and wherein the link lever head is configured to interact with the adjusting ring. 
     
     
       15. The charging device according to  claim 13 , wherein the groove on the blade bearing ring is open towards a face end and to the outside of the bearing ring. 
     
     
       16. The charging device according to  claim 13 , wherein the eccentric is at least one of caulked, riveted and spread to the link lever head. 
     
     
       17. The charging device according to  claim 13 , wherein the eccentric includes a sleeve body, which can be inserted into an opening formed in the link lever head, and a holding portion of the sleeve body is arranged in the interior of the opening, wherein a core body is arranged in the interior of the sleeve body to radially brace the holding portion in the opening and fixe the eccentric on the link lever head at least one of axially and rotationally. 
     
     
       18. The charging device according to  claim 17 , wherein the sleeve body in the holding portion includes an internal cone configured to interact with an external cone of the core body for radially bracing the holding portion. 
     
     
       19. The charging device according to  claim 17 , wherein the core body has at least one of a crowned and spherically curved outer cross section. 
     
     
       20. The charging device according to  claim 17 , wherein the sleeve body on its outside in the holding portion includes a friction-increasing layer, and wherein the friction-increasing layer is a chemical nickel matrix with silicon carbide particles embedded therein.